linux-kernel - Re: [PATCH 2/2] ARM: dts: imx7: add DMA properties for ECSPI

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Date:   Wed, 13 Feb 2019 11:56:42 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Stefan Agner <stefan@...er.ch>
Cc:     Shawn Guo <shawnguo@...nel.org>, s.hauer@...gutronix.de,
        Trent Piepho <tpiepho@...inj.com>, linux-imx@....com,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, fabio.estevam@....com,
        mark.rutland@....com, linux-arm-kernel@...ts.infradead.org,
        kernel@...gutronix.de
Subject: Re: [PATCH 2/2] ARM: dts: imx7: add DMA properties for ECSPI

On Tue, Feb 12, 2019 at 08:20:46PM +0100, Stefan Agner wrote:

> > I dropped both patches from my tree.

> I think this is the wrong approach to disable DMA on those devices. The
> device tree is supposed to describe the complete hardware. If the driver
> is not ready to support DMA for that particular variant, we should add
> this information in the driver. We have compatible strings for i.MX
> 6UL/i.MX 7 to disable DMA accordingly.

Yes, that seems sensible - it's vanishingly unlikely that there's any
problem in the hardware here, it's software bugs and quirking in the
driver seems better than changing the DT.

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